:root {
  color-scheme: light dark;
  --bg: #f7f8fa;
  --fg: #1a1d23;
  --muted: #5b626c;
  --card: #ffffff;
  --border: #d8dde4;
  --accent: #c47318;
  --accent-fg: #ffffff;
  --user-bg: #e8eef6;
  --user-fg: #1a1d23;
  --asst-bg: #ffffff;
  --asst-fg: #1a1d23;
  --good: #1b5e2d;
  --warn: #6e5500;
  --bad: #7a1d1d;
  --tool-bg: #fff8e1;
  --tool-fg: #6e5500;
  --tool-bd: #d9b95c;
  --focus: #1565c0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15181d;
    --fg: #e7e9ee;
    --muted: #9aa1ad;
    --card: #1f242b;
    --border: #2e333c;
    --accent: #f0a04b;
    --accent-fg: #15181d;
    --user-bg: #233040;
    --user-fg: #e7e9ee;
    --asst-bg: #1f242b;
    --asst-fg: #e7e9ee;
    --good: #9ad8a8;
    --warn: #f0d480;
    --bad: #f0a4a0;
    --tool-bg: #3a2f0d;
    --tool-fg: #f0d480;
    --tool-bd: #7a6020;
    --focus: #64b5f6;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute;
  top: -40px; left: 8px;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 8px 12px;
  border-radius: 4px;
  z-index: 100;
  text-decoration: none;
  font-weight: 600;
}
.skip-link:focus {
  top: 8px;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

/* ---------- Status bar ---------- */

.status-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.title-block { display: flex; align-items: baseline; gap: 10px; min-width: 0; }
.title { font-size: 1.15rem; font-weight: 700; letter-spacing: 0.5px; }
.user-name { color: var(--muted); font-size: 0.9rem; }

.meter {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-variant-numeric: tabular-nums;
  font-size: 0.95rem;
  padding: 6px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.meter-label { color: var(--muted); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; }
.meter-val { font-weight: 700; color: var(--good); }
.meter-val.warn { color: var(--warn); }
.meter-val.bad { color: var(--bad); }
.meter-sep { color: var(--muted); }
.meter-cap { color: var(--muted); }
.meter-last { color: var(--muted); font-size: 0.85rem; margin-left: 6px; padding-left: 10px; border-left: 1px solid var(--border); }
.meter-last:empty { display: none; }

.model-pill { display: flex; align-items: center; }
.model-pill select {
  font: inherit;
  font-size: 0.95rem;
  padding: 6px 10px;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
}

/* ---------- Chat log ---------- */

.chat {
  flex: 1;
  overflow-y: auto;
  padding: 24px 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.welcome {
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
  padding: 12px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  max-width: 600px;
  align-self: center;
}
.welcome kbd {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: ui-monospace, "Consolas", monospace;
  font-size: 0.85em;
}

.msg {
  max-width: 720px;
  width: fit-content;
  padding: 12px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}
.msg.user {
  background: var(--user-bg);
  color: var(--user-fg);
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}
.msg.assistant {
  background: var(--asst-bg);
  color: var(--asst-fg);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}
.msg .role-label {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  display: block;
  margin-bottom: 4px;
}

.tool-chip {
  display: inline-block;
  font-size: 0.78rem;
  padding: 2px 10px;
  margin: 4px 4px 0 0;
  background: var(--tool-bg);
  color: var(--tool-fg);
  border: 1px solid var(--tool-bd);
  border-radius: 999px;
  font-variant-numeric: tabular-nums;
}

.cost-chip {
  align-self: flex-start;
  font-size: 0.78rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  padding: 0 6px;
}

.error-msg {
  align-self: stretch;
  background: rgba(216, 84, 84, 0.12);
  color: var(--bad);
  border: 1px solid var(--bad);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.9rem;
}

/* ---------- Composer ---------- */

.composer {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 10px;
  padding: 12px 20px 16px;
  background: var(--card);
  border-top: 1px solid var(--border);
  align-items: end;
}

.composer textarea {
  font: inherit;
  font-size: 1rem;
  padding: 12px 14px;
  background: var(--bg);
  color: var(--fg);
  border: 1px solid var(--border);
  border-radius: 10px;
  resize: vertical;
  min-height: 48px;
  max-height: 200px;
}

.composer button {
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 16px;
  background: var(--accent);
  color: var(--accent-fg);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  min-height: 48px;
}
.composer button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.composer button:hover:not(:disabled) {
  filter: brightness(1.08);
}

.mic {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--card) !important;
  color: var(--fg) !important;
  border: 1px solid var(--border) !important;
}
.mic[aria-pressed="true"] {
  background: var(--accent) !important;
  color: var(--accent-fg) !important;
  animation: pulse 1.2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(196, 115, 24, 0.5); }
  50%      { box-shadow: 0 0 0 8px rgba(196, 115, 24, 0); }
}

.mic-glyph {
  width: 14px; height: 14px;
  border-radius: 50%;
  background: currentColor;
  display: inline-block;
}

/* ---------- Toast ---------- */

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bad);
  color: white;
  padding: 12px 18px;
  border-radius: 10px;
  font-size: 0.9rem;
  z-index: 1000;
  box-shadow: 0 4px 14px rgba(0,0,0,0.25);
  max-width: 90%;
}
.toast[hidden] { display: none; }
.toast.info { background: var(--accent); color: var(--accent-fg); }

/* ---------- Mobile tightening ---------- */

@media (max-width: 600px) {
  .status-bar { flex-direction: column; align-items: stretch; gap: 8px; padding: 10px 14px; }
  .meter { justify-content: center; }
  .chat { padding: 16px 12px; }
  .composer { padding: 10px 12px 14px; grid-template-columns: 1fr; }
  .composer textarea { min-height: 60px; }
  .mic, .composer button { width: 100%; }
}